时间:2021-07-01 10:21:17 帮助过:12人阅读
2、安装下载的安装包
3、我们在Visual Studio里创建一个Web Application,然后引入X:/XXXX/MySQL/MySQL Connector Net 6.3.6/Assemblies下的v2.0或v4.0里的DLL文件。
在MySQLHelper里面加入:
using MySql.Data.MySqlClient;
在Web.config里面加入MySQL数据库的连接字符串:
4、封装好的MySQLHelper类
using System;using System.Collections.Generic;using System.Data;using System.Collections;using MySql.Data.MySqlClient;using System.Configuration;namespace DBUtility{////// The SQLHelper class is intended to encapsulate high performance,/// scalable best practices for common uses of SqlClient./// public abstract class MySQLHelper{ // Read the connection strings from the configuration file public static readonly string ConnectionStringLocalTransaction = ConfigurationManager.ConnectionStrings["OraConnString1"].ConnectionString; public static readonly string ConnectionStringInventoryDistributedTransaction = ConfigurationManager.ConnectionStrings["OraConnString2"].ConnectionString; public static readonly string ConnectionStringOrderDistributedTransaction = ConfigurationManager.ConnectionStrings["OraConnString3"].ConnectionString; public static readonly string ConnectionStringProfile = ConfigurationManager.ConnectionStrings["OraProfileConnString"].ConnectionString; public static readonly string ConnectionStringMembership = ConfigurationManager.ConnectionStrings["OraMembershipConnString"].ConnectionString; //Create a hashtable for the parameter cached private static Hashtable parmCache = Hashtable.Synchronized(new Hashtable()); ////// Execute a database query which does not include a select /// /// Connection string to database /// Command type either stored procedure or SQL /// Acutall SQL Command /// Parameters to bind to the command ///public static int ExecuteNonQuery(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { // Create a new MySql command MySqlCommand cmd = new MySqlCommand(); //Create a connection using (MySqlConnection connection = new MySqlConnection(connectionString)) { //Prepare the command PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters); //Execute the command int val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } } /// /// Execute an MySqlCommand (that returns no resultset) against an existing database transaction /// using the provided parameters. /// ////// e.g.: ///int result = ExecuteNonQuery(trans, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24)); /// /// an existing database transaction /// the CommandType (stored procedure, text, etc.) /// the stored procedure name or PL/SQL command /// an array of MySqlParamters used to execute the command ///an int representing the number of rows affected by the command public static int ExecuteNonQuery(MySqlTransaction trans, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { MySqlCommand cmd = new MySqlCommand(); PrepareCommand(cmd, trans.Connection, trans, cmdType, cmdText, commandParameters); int val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } ////// Execute an MySqlCommand (that returns no resultset) against an existing database connection /// using the provided parameters. /// ////// e.g.: ///int result = ExecuteNonQuery(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24)); /// /// an existing database connection /// the CommandType (stored procedure, text, etc.) /// the stored procedure name or PL/SQL command /// an array of MySqlParamters used to execute the command ///an int representing the number of rows affected by the command public static int ExecuteNonQuery(MySqlConnection connection, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { MySqlCommand cmd = new MySqlCommand(); PrepareCommand(cmd, connection, null, cmdType, cmdText, commandParameters); int val = cmd.ExecuteNonQuery(); cmd.Parameters.Clear(); return val; } ////// Execute a select query that will return a result set /// /// Connection string //// the CommandType (stored procedure, text, etc.) /// the stored procedure name or PL/SQL command /// an array of MySqlParamters used to execute the command ///public static MySqlDataReader ExecuteReader(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { //Create the command and connection MySqlCommand cmd = new MySqlCommand(); MySqlConnection conn = new MySqlConnection(connectionString); try { //Prepare the command to execute PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); //Execute the query, stating that the connection should close when the resulting datareader has been read MySqlDataReader rdr = cmd.ExecuteReader(CommandBehavior.CloseConnection); cmd.Parameters.Clear(); return rdr; } catch { //If an error occurs close the connection as the reader will not be used and we expect it to close the connection conn.Close(); throw; } } /// /// Execute an MySqlCommand that returns the first column of the first record against the database specified in the connection string /// using the provided parameters. /// ////// e.g.: ///Object obj = ExecuteScalar(connString, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24)); /// /// a valid connection string for a SqlConnection /// the CommandType (stored procedure, text, etc.) /// the stored procedure name or PL/SQL command /// an array of MySqlParamters used to execute the command ///An object that should be converted to the expected type using Convert.To{Type} public static object ExecuteScalar(string connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { MySqlCommand cmd = new MySqlCommand(); using (MySqlConnection conn = new MySqlConnection(connectionString)) { PrepareCommand(cmd, conn, null, cmdType, cmdText, commandParameters); object val = cmd.ExecuteScalar(); cmd.Parameters.Clear(); return val; } } ////// Execute a MySqlCommand (that returns a 1x1 resultset) against the specified SqlTransaction /// using the provided parameters. /// /// A valid SqlTransaction /// The CommandType (stored procedure, text, etc.) /// The stored procedure name or PL/SQL command /// An array of MySqlParamters used to execute the command ///An object containing the value in the 1x1 resultset generated by the command public static object ExecuteScalar(MySqlTransaction transaction, CommandType commandType, string commandText, params MySqlParameter[] commandParameters) { if (transaction == null) throw new ArgumentNullException("transaction"); if (transaction != null && transaction.Connection == null) throw new ArgumentException("The transaction was rollbacked or commited, please provide an open transaction.", "transaction"); // Create a command and prepare it for execution MySqlCommand cmd = new MySqlCommand(); PrepareCommand(cmd, transaction.Connection, transaction, commandType, commandText, commandParameters); // Execute the command & return the results object retval = cmd.ExecuteScalar(); // Detach the SqlParameters from the command object, so they can be used again cmd.Parameters.Clear(); return retval; } ////// Execute an MySqlCommand that returns the first column of the first record against an existing database connection /// using the provided parameters. /// ////// e.g.: ///Object obj = ExecuteScalar(conn, CommandType.StoredProcedure, "PublishOrders", new MySqlParameter(":prodid", 24)); /// /// an existing database connection /// the CommandType (stored procedure, text, etc.) /// the stored procedure name or PL/SQL command /// an array of MySqlParamters used to execute the command ///An object that should be converted to the expected type using Convert.To{Type} public static object ExecuteScalar(MySqlConnection connectionString, CommandType cmdType, string cmdText, params MySqlParameter[] commandParameters) { MySqlCommand cmd = new MySqlCommand(); PrepareCommand(cmd, connectionString, null, cmdType, cmdText, commandParameters); object val = cmd.ExecuteScalar(); cmd.Parameters.Clear(); return val; } ////// Add a set of parameters to the cached /// /// Key value to look up the parameters /// Actual parameters to cached public static void CacheParameters(string cacheKey, params MySqlParameter[] commandParameters) { parmCache[cacheKey] = commandParameters; } ////// Fetch parameters from the cache /// /// Key to look up the parameters ///public static MySqlParameter[] GetCachedParameters(string cacheKey) { MySqlParameter[] cachedParms = (MySqlParameter[])parmCache[cacheKey]; if (cachedParms == null) return null; // If the parameters are in the cache MySqlParameter[] clonedParms = new MySqlParameter[cachedParms.Length]; // return a copy of the parameters for (int i = 0, j = cachedParms.Length; i < j; i++) clonedParms[i] = (MySqlParameter)((ICloneable)cachedParms[i]).Clone(); return clonedParms; } /// /// Internal function to prepare a command for execution by the database /// /// Existing command object /// Database connection object /// Optional transaction object /// Command type, e.g. stored procedure /// Command test /// Parameters for the command private static void PrepareCommand(MySqlCommand cmd, MySqlConnection conn, MySqlTransaction trans, CommandType cmdType, string cmdText, MySqlParameter[] commandParameters) { //Open the connection if required if (conn.State != ConnectionState.Open) conn.Open(); //Set up the command cmd.Connection = conn; cmd.CommandText = cmdText; cmd.CommandType = cmdType; //Bind it to the transaction if it exists if (trans != null) cmd.Transaction = trans; // Bind the parameters passed in if (commandParameters != null) { foreach (MySqlParameter parm in commandParameters) cmd.Parameters.Add(parm); } } ////// Converter to use boolean data type with MySql /// /// Value to convert ///public static string MySqlBit(bool value) { if (value) return "Y"; else return "N"; } /// /// Converter to use boolean data type with MySql /// /// Value to convert ///public static bool MySqlBool(string value) { if (value.Equals("Y")) return true; else return false; }}}